![]() Its actual voltage gain in a circuit can be varied by a number of different factors, including Va, which is the actual voltage drop across the valve Ia, the anode current, and for pentodes even the screen voltage, since this also affects anode current. ![]() Unfortunately it is not so simple for a thermionic valve. Very useful for telling you the steady state DC voltages of a circuit biased by your chosen resistor values (or not!) as well the AC performance. Then it was simply a case of applying the amplified collector current across the load resistor. These were transistor circuits of course, and the calculations were fairly straightforward all you really needed to provide was the Hfe (current gain) of the device and the program worked out the Log of the Vbe base emitter voltage drop for a particular input current, which of course is logarithmic, and which was also needed to get an accurate idea of how the AC input current behaved. Once had a big book full of little BASIC programs for calculating various simple electronic circuits. How To Calculate The Theoretical Voltage Gain Of A Small Signal Amplifier Stage
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